Basiswissen

Einheiten des Betrags des Poynting-Vektors =====

• W/m² als 👉 Leistungsdichte
  

• J/(m²·s) 👉 Leistungsdichte
  

• N/(m·s) 👉 Leistungsdichte
  

• N·s/m³ 👉 Impulsstromdichte [des Feldes]
  

• (N·s/m³)·(m²/s²) 👉 Impulsstromdichte [des Feldes]
  

• N·(m·s) 👉 Impulsstromdichte [des Feldes]
  

Fußnoten

• [1] Bedeutung nach Feynman: "whenever there is a flow of energy in any circumstance at all (field energy or any other kind of energy), the energy flowing through a unit area per unit time, when multiplied by 1/c², is equal to the momentum per unit volume in the space. In the special case of electrodynamics, this theorem gives the result that g is 1/c² times the Poynting vector: [g = S:c²]. So the Poynting vector gives not only energy flow but, if you divide by c², also the momentum density." In: Feynman, Richard P., Robert B. Leighton, and Matthew Sands. The Feynman Lectures on Physics. Vol. II, Mainly Electromagnetism and Matter. Chapter 27, "Field Energy and Field Momentum." Reading, MA: Addison-Wesley, 1964. Online: https://www.feynmanlectures.caltech.edu/II_27.html
  

Siehe auch